气候变化领域集成服务门户(CCPortal): Linkage of water vapor distribution in the lower stratosphere to organized Asian summer monsoon convection

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DOI	10.1007/s00382-021-05772-2
	Linkage of water vapor distribution in the lower stratosphere to organized Asian summer monsoon convection
	Singh B.B.; Krishnan R.; Ayantika D.C.; Vellore R.K.; Sabin T.P.; Kumar K.R.; Brunamonti S.; Hanumanthu S.; Jorge T.; Oelsner P.; Sonbawne S.; Naja M.; Fadnavis S.; Peter T.; Srivastava M.K.
发表日期	2021
ISSN	0930-7575
起始页码	985
结束页码	1004
英文摘要	Accumulation of water vapor in the upper troposphere/lower stratosphere (UT/LS) over the Asian continent is a recognized feature during the boreal summer monsoon. While there has been a debate on the role of monsoon convective intensities on the UT/LS water vapor accumulations, there are ambiguities with regard to the effects of organized monsoon convection on the spatial distribution of water vapor. We provide insights into this aspect using high precision balloon measurements of water vapor from a high-elevation site Nainital (29.4° N, 79.5° E), India, located in the Himalayan foothills and satellite retrievals of water vapor from the Microwave Limb Sounder (MLS). We also use precipitation estimates from the Tropical Rainfall Measuring Mission (TRMM) satellite (i.e., merged product 3B42 and precipitation radar 3A25 estimates of rain rate and rain type viz convective/stratiform), reanalysis circulation data, as well as numerical model simulations. We first evaluate the MLS estimates of water vapor mixing ratios with in situ high precision hygrometer balloon observations over Nainital. It is seen from our analyses of the MLS data that the LS water vapor distribution is closely linked to the organization of the South Asian monsoon convection and its influence on the UT/LS circulation. This link between LS water vapor distribution and organized monsoon convection is also captured in the in situ observations on 3 August 2016. It is evidenced that periods of organized summer monsoon convective activity over the Indian subcontinent and Bay of Bengal promote divergence of water vapor flux in the UT/LS; additionally the Tibetan anticyclonic circulation causes widespread distribution of the UT/LS water vapor. In addition to the effects of Asian monsoon convection, we also note that global climate drivers such as El Niño-Southern Oscillation (ENSO), Brewer–Dobson circulation (BDC), and Quasi-Biennial Oscillation (QBO) can contribute to nearly 38% of the UT/LS water vapor variability over the Asian monsoon region. The main result of our study indicates that widespread spatial distribution and accumulation of water vapor in the LS (about 80% of total accumulation between May and August months) tend to co-occur with organized monsoon convection, intensified divergence of water vapor flux in the UT/LS and intensified Tibetan anticyclone. On the other hand, the circulation response and LS water vapor distribution to pre-monsoon localized deep convection tend to have a limited spatial scale confined to Southeast Asia. Results from model experiments suggest that the UT/LS circulation pattern to organized monsoon convection has resemblance to stationary Rossby waves forced by organized latent heating, with the westward extending response larger by about 15° longitudes as compared to that of the pre-monsoon localized deep convection. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183478
作者单位	Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune, 411 008, India; Department of Geophysics, Banaras Hindu University, Varanasi, India; Centre for Atmospheric Sciences, Indian Institute of Technology (IIT), Delhi, India; Institute for Atmospheric and Climate Science (IAC), Swiss Federal Institute of Technology (ETH), Zurich, Switzerland; Forschungszentrum Jülich (FZJ), Institute of the Energy and Climate Research-Stratosphere (IEK-7), Jülich, Germany; Deutscher Wetterdienst (DWD)/GCOS Reference Upper Air Network (GRUAN) Lead Center, Lindenberg, Germany; Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital, India
推荐引用方式 GB/T 7714	Singh B.B.,Krishnan R.,Ayantika D.C.,et al. Linkage of water vapor distribution in the lower stratosphere to organized Asian summer monsoon convection[J],2021.
APA	Singh B.B..,Krishnan R..,Ayantika D.C..,Vellore R.K..,Sabin T.P..,...&Srivastava M.K..(2021).Linkage of water vapor distribution in the lower stratosphere to organized Asian summer monsoon convection.Climate Dynamics.
MLA	Singh B.B.,et al."Linkage of water vapor distribution in the lower stratosphere to organized Asian summer monsoon convection".Climate Dynamics (2021).